Editing NHRA-legal roll bar (section)
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====Rear braces==== <blockquote> ''"Rear braces must be of the same diameter and wall thickness as the roll bar and intersect the roll bar at a point not more than 5" from the top of the roll bar."'' </blockquote> "Same diameter" means minimum 1 3/4" (1.750") "Same wall thickness means 0.118" for mild steel and 0.083" for chromoly "Not more than 5" means do not move the rear braces over to the side of the car to the vertical part of the B bar any further down than 5" as measured from the top of the B bar. The closer to the top of the B bar these rear braces are, the better they can prevent the B bar from forward or rearward collapse (lozenging). <blockquote> ''"Crossbar and rear braces must be welded to main hoop."'' </blockquote> The main hoop is normally called the B bar in tech lingo.
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